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Des Moines police said they received a call just after 5 p.m. Sunday of a possible homicide at a residence located at 321 East Diehl Ave. When police arrived, they discovered 35-year-old Mark Edward Hruska was dead from gunshot wounds.

Police were notified that the suspect was inside the residence next door. Officers were able to make contact with him by phone.

Police said 30-year-old Patrick William Kirwan surrendered peacefully. He is charged with first-degree murder and is being held in the Polk County Jail.

“From our understanding, it just had to do with these two males. Certainly, many homicide investigations involve additional interviews in the following days to tie up loose ends. That is likely to happen, but at this point now it appears that the only suspect is in custody," Sgt. Jason Halifax said.

Halifax said the two men were neighbors and that it is believed the men were in an argument prior to the shooting. After the suspect shot the man, Halifax said he called his girlfriend, saying he shot and killed his neighbor. The girlfriend then called 911.

Patrick William Kirwan made a court appearance Monday morning. He is charged with first-degree murder. A judge ordered Kirwan to be held in the Polk County Jail on a $500,000 bond.

Des Moines police said this is the second confirmed homicide being investigated by the department this year.